CN201449569U - Micro power consumption and low voltage drop sensor constant current driving circuit - Google Patents
Micro power consumption and low voltage drop sensor constant current driving circuit Download PDFInfo
- Publication number
- CN201449569U CN201449569U CN2009200623609U CN200920062360U CN201449569U CN 201449569 U CN201449569 U CN 201449569U CN 2009200623609 U CN2009200623609 U CN 2009200623609U CN 200920062360 U CN200920062360 U CN 200920062360U CN 201449569 U CN201449569 U CN 201449569U
- Authority
- CN
- China
- Prior art keywords
- circuit
- reference voltage
- voltage
- low
- chip microcomputer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000005265 energy consumption Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 4
- 230000000087 stabilizing effect Effects 0.000 abstract 2
- 238000010586 diagram Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
Images
Landscapes
- Measuring Fluid Pressure (AREA)
Abstract
The utility model relates to the technical field of sensor driving and discloses a micro power consumption and low voltage drop sensor constant current driving circuit. The driving circuit comprises a reference voltage stabilizing circuit (91), a follower circuit (92), a secondary reference voltage circuit (93) and a constant current circuit (94), wherein the reference voltage stabilizing circuit (91) can obtain a stable voltage output; the follower circuit (92) improves the driving capacity and efficiency of voltage; the secondary reference voltage circuit (93) provides lower voltage for the constant current circuit (94); and the voltage connected to a U3A non inverting input end is fairly low, thus ensuring that the pressure drop of the circuit of the level only equals the sum of the self voltage drop of the U3A non inverting input end and an operational amplifier U3A. After a singlechip control signal passes through the driving circuit, the low-voltage, low-voltage-drop, low-power-consumption and constant-current drive of the sensor can be realized, thus being capable of prolonging the service life of a battery-powered meter product and saving precious energy.
Description
Technical field
The utility model relates to the sensor drive technical field, relates in particular to a kind of constant-current drive circuit that is used for the switch of digital instrument.
Background technology
When a lot of digitized instrument equipment began to move towards microminiaturization, low power consumption, traditional circuit design and power consumption can not satisfy the requirement of today to low-power consumption; Need to use powered battery on the instrument of especially portable, low-power consumption, the life-span of battery and utilization ratio are important indicators of instrument.Therefore, just seem very important of whether power saving of driving circuit, required pressure drop size.
At present have following characteristics from constant-current driven chip or the element that can purchase on the market, operating voltage height, working current are big, work pressure drop height, limited application greatly in the low-power consumption sensor field, simultaneously in battery powered instrument system, cause the working current of system bigger, reduce serviceable life, be unfavorable for the reasonable utilization of the energy.Such as the chips such as AD693 of XTR101, XTR102, XTR105, XTR106 and the U.S. ADI company of American TI Company, operating voltage needs 24V, and working current needs 4-20mA, and the work pressure drop is greater than 7V.
The utility model content
The technical problems to be solved in the utility model is that the little power consumption that solves sensor drives design, thereby low-voltage, the low pressure drop of sensor, the difficult problem of low-power consumption constant-current driving have been solved, battery powered instrument product can be increased the service life, the saves valuable energy.
In order to address the above problem, the little pressure drop sensor constant-current drive circuit low in energy consumption of the utility model comprises reference voltage-stabilizing circuit, follow circuit, secondary reference voltage circuit, constant-current circuit.The IO termination of described single-chip microcomputer is gone into reference voltage-stabilizing circuit, and the reference voltage-stabilizing circuit output voltage is to follow circuit, follow circuit be connected with the secondary reference voltage circuit and output voltage to the secondary reference voltage circuit, through exporting constant-current circuit to after the resistance in series dividing potential drop.
Preferably, also comprise on-off circuit between the IO of described single-chip microcomputer end and the reference voltage-stabilizing circuit; Described on-off circuit can be the amplifying circuit that triode is formed, and perhaps integrated switching circuit is used to obtain lower switching voltage and protection single-chip microcomputer.Described on-off circuit can be amplifying circuit or the integrated switching circuit that triode is formed.
Reference voltage-stabilizing circuit comprises switched voltage output+V, R1 and reference power supply U1.Wherein U1 is the power supply that high precision, low temperature float, and can select lm 285 series, tl431 series, ad series etc.Switched voltage output+V, R1 and reference power supply U1 series connection, the minus earth of U1 constitutes reference voltage-stabilizing circuit.
Follow circuit comprises operational amplifier U2A.3 pin of operational amplifier U2A connect the positive pole of U1, and 2 pin are connected with 1 pin, constitute follow circuit.
The secondary reference voltage circuit comprises R2, R3.The 1 pin output voltage of operational amplifier U2A obtains lower reference voltage through R2, R3 series connection and ground connection.
Constant-current circuit comprises operational amplifier U3A, R4 and load RL.
Operational amplifier U2A, operational amplifier U3A can select tlv series, lm series, tlc series, opa series etc.
Reference voltage-stabilizing circuit can obtain a stable voltage output; Follow circuit has improved the driving force and the efficient of voltage; The secondary reference voltage circuit provides lower voltage for constant-current circuit; Because thereby the very low pressure drop that has guaranteed this grade circuit of the voltage that the U3A normal phase input end inserts only is self pressure drop sum of U3A normal phase input end and operational amplifier U3A.
Can realize low-voltage, low pressure drop, the low-power consumption constant-current driving of sensor behind the little pressure drop sensor constant-current drive circuit low in energy consumption of Single-chip Controlling signal process the utility model, battery powered instrument product can be increased the service life, the saves valuable energy.Use single-chip microcomputer as control chip, circuit can be operated in dormant state, has further reduced the power consumption of circuit, has improved the service efficiency of the energy.
In order to reach better technique effect, can between Single-chip Controlling signal and reference voltage-stabilizing circuit, be connected in series an on-off circuit.On-off circuit comprises resistance R 12, R13, R14, NPN triode Q6 and PNP triode Q8.On-off circuit can be protected the IO driving force of single-chip microcomputer, obtains minimum switching voltage simultaneously and falls.On-off circuit also can be selected other integrated switching circuits.
The utility model can be reduced to 3.0V with the operating voltage of driving circuit, and working current is reduced to 2.0mA, and the pressure drop of simultaneity factor can be controlled in the 0.4V.This technology is applied on the instrument will produce tangible technique effect.
Description of drawings
Fig. 1 is the circuit diagram of the utility model embodiment one;
Fig. 2 is the circuit diagram of the utility model embodiment two;
Fig. 3 is the circuit diagram of the utility model embodiment three;
Fig. 4 is the circuit diagram of the utility model embodiment four.
Embodiment
Describe the technical solution of the utility model in detail below in conjunction with accompanying drawing and specific embodiment.
Embodiment one:
As Fig. 1 is the circuit diagram of the utility model embodiment one.
The little pressure drop sensor constant-current drive circuit low in energy consumption of present embodiment comprises on-off circuit 95, reference voltage-stabilizing circuit 91, follow circuit 92, secondary reference voltage circuit 93, constant-current circuit 94.
On-off circuit 15 comprises resistance R 12, R13, R14, NPN triode Q6 and PNP triode Q8.The IO end that the grounded emitter of NPN triode Q6, base series resistor R12 connect described single-chip microcomputer; The collector series resistance R13 of NPN triode Q6 connects the base stage of PNP triode Q8; The collector of PNP triode Q8 connects the base stage that externally fed parallel-series R14 connects PNP triode Q8; The emitter of PNP triode Q8 inserts described reference voltage-stabilizing circuit 91.
Reference voltage-stabilizing circuit 91 comprises switched voltage output+V, R1 and reference power supply U1.Wherein U1 is the power supply that high precision, low temperature float, and can select lm 285 series, tl431 series, ad series etc.Switched voltage output+V, R1 and reference power supply U1 series connection, the minus earth of U1 constitutes reference voltage-stabilizing circuit 91.
Follow circuit 92 comprises operational amplifier U2A.3 pin of operational amplifier U2A connect the positive pole of U1, and 2 pin are connected with 1 pin, constitute follow circuit 92.
Secondary reference voltage circuit 93 comprises R2, R3.The 1 pin output voltage of operational amplifier U2A obtains lower reference voltage through R2, R3 series connection and ground connection.
Constant-current circuit 94 comprises operational amplifier U3A, R4 and load RL.
Operational amplifier U2A, U3A can select tlv series, lm series, tlc series, opa series etc.
Single-chip microcomputer signal MCU-IO input switching circuit.
Embodiment two:
As Fig. 2 is the circuit diagram of the utility model embodiment two.
The little pressure drop sensor constant-current drive circuit low in energy consumption of present embodiment comprises on-off circuit 95, reference voltage-stabilizing circuit 91, follow circuit 92, secondary reference voltage circuit 93, constant-current circuit 94.
On-off circuit 25 comprises resistance R 12, NPN triode Q6.The base stage series connection R12 of NPN triode (Q6) connects the IO end of single-chip microcomputer, and collector connects externally fed, and emitter inserts described reference voltage-stabilizing circuit (91).
Reference voltage-stabilizing circuit 91 comprises switched voltage output+V, R1 and reference power supply U1.Wherein U1 is the power supply that high precision, low temperature float, and can select lm 285 series, tl431 series, ad series etc.Switched voltage output+V, R1 and reference power supply U1 series connection, the minus earth of U1 constitutes reference voltage-stabilizing circuit 91.
Follow circuit 92 comprises operational amplifier U2A.3 pin of operational amplifier U2A connect the positive pole of U1, and 2 pin are connected with 1 pin, constitute follow circuit 92.
Secondary reference voltage circuit 93 comprises R2, R3.The 1 pin output voltage of operational amplifier U2A obtains lower reference voltage through R2, R3 series connection and ground connection.
Constant-current circuit 94 comprises operational amplifier U3A, R4 and load RL.
Operational amplifier U2A, U3A can select tlv series, lm series, tlc series, opa series etc.
Single-chip microcomputer signal MCU-IO input switching circuit.
Embodiment three:
As Fig. 3 is the circuit diagram of the utility model embodiment three.
The little pressure drop sensor constant-current drive circuit low in energy consumption of present embodiment comprises on-off circuit 95, reference voltage-stabilizing circuit 91, follow circuit 92, secondary reference voltage circuit 93, constant-current circuit 94.
On-off circuit 35 is integrated switching circuit or other on-off circuits, connects single-chip microcomputer IO end, externally fed, reference voltage-stabilizing circuit (91), by the break-make of single-chip microcomputer IO end signal control externally fed toward reference voltage-stabilizing circuit (91) power supply.
Reference voltage-stabilizing circuit 91 comprises switched voltage output+V, R1 and reference power supply U1.Wherein U1 is the power supply that high precision, low temperature float, and can select lm 285 series, tl431 series, ad series etc.Switched voltage output+V, R1 and reference power supply U1 series connection, the minus earth of U1 constitutes reference voltage-stabilizing circuit 91.
Follow circuit 92 comprises operational amplifier U2A.3 pin of operational amplifier U2A connect the positive pole of U1, and 2 pin are connected with 1 pin, constitute follow circuit 92.
Secondary reference voltage circuit 93 comprises R2, R3.The 1 pin output voltage of operational amplifier U2A obtains lower reference voltage through R2, R3 series connection and ground connection.
Constant-current circuit 94 comprises operational amplifier U3A, R4 and load RL.
Operational amplifier U2A, U3A can select tlv series, lm series, tlc series, opa series etc.
Single-chip microcomputer signal MCU-IO input switching circuit.
Embodiment four:
As Fig. 4 is the circuit diagram of the utility model embodiment four.
The little pressure drop sensor constant-current drive circuit low in energy consumption of present embodiment comprises reference voltage-stabilizing circuit 91, follow circuit 92, secondary reference voltage circuit 93, constant-current circuit 94.
Reference voltage-stabilizing circuit 91, follow circuit 92, secondary reference voltage circuit 93, constant-current circuit 94 are with to implement one identical.
The direct input reference mu balanced circuit 91 of single-chip microcomputer signal MCU-IO.
Claims (5)
1. a little pressure drop sensor constant-current drive circuit low in energy consumption comprises single-chip microcomputer and driving circuit, it is characterized in that: described driving circuit comprises reference voltage-stabilizing circuit (91), follow circuit (92), secondary reference voltage circuit (93), constant-current circuit (94); The IO termination of described single-chip microcomputer is gone into reference voltage-stabilizing circuit (91), reference voltage-stabilizing circuit (91) output voltage is to follow circuit (92), follow circuit is connected also, and output voltage exports constant-current circuit (94) to secondary reference voltage circuit (93) to after the process resistance in series dividing potential drop with secondary reference voltage circuit (93).
2. little pressure drop sensor constant-current drive circuit low in energy consumption as claimed in claim 1 is characterized in that: also comprise on-off circuit between the IO end of described single-chip microcomputer and the reference voltage-stabilizing circuit (91); Described on-off circuit can be the amplifying circuit that triode is formed, and perhaps integrated switching circuit is used to obtain lower switching voltage and protection single-chip microcomputer.
3. little pressure drop sensor constant-current drive circuit low in energy consumption as claimed in claim 2 is characterized in that: described on-off circuit (15) comprises resistance R 12, R13, R14, NPN triode (Q6) and PNP triode (Q8); The IO end that the grounded emitter of NPN triode (Q6), base series resistor R12 connect described single-chip microcomputer; The collector series resistance R13 of NPN triode (Q6) connects the base stage of PNP triode (Q8); The collector of PNP triode (Q8) connects the base stage that externally fed parallel-series R14 connects PNP triode (Q8); The emitter of PNP triode (Q8) inserts described reference voltage-stabilizing circuit (91).
4. little pressure drop sensor constant-current drive circuit low in energy consumption as claimed in claim 2 is characterized in that: described on-off circuit (25) comprises resistance R 12, NPN triode (Q6); The base stage series connection R12 of NPN triode (Q6) connects the IO end of single-chip microcomputer, and collector connects externally fed, and emitter inserts described reference voltage-stabilizing circuit (91).
5. little pressure drop sensor constant-current drive circuit low in energy consumption as claimed in claim 2, it is characterized in that: described on-off circuit (35) comprises integrated switching circuit, connect single-chip microcomputer IO end, externally fed, reference voltage-stabilizing circuit (91), by the break-make of single-chip microcomputer IO end signal control externally fed toward reference voltage-stabilizing circuit (91) power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200623609U CN201449569U (en) | 2009-08-14 | 2009-08-14 | Micro power consumption and low voltage drop sensor constant current driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200623609U CN201449569U (en) | 2009-08-14 | 2009-08-14 | Micro power consumption and low voltage drop sensor constant current driving circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201449569U true CN201449569U (en) | 2010-05-05 |
Family
ID=42554291
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009200623609U Expired - Fee Related CN201449569U (en) | 2009-08-14 | 2009-08-14 | Micro power consumption and low voltage drop sensor constant current driving circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201449569U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113110225A (en) * | 2021-05-07 | 2021-07-13 | 彭兴会 | Control circuit for executing low power consumption mode |
| CN119311066A (en) * | 2024-12-16 | 2025-01-14 | 深圳市万微半导体有限公司 | A low power consumption circuit for power management chip |
-
2009
- 2009-08-14 CN CN2009200623609U patent/CN201449569U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113110225A (en) * | 2021-05-07 | 2021-07-13 | 彭兴会 | Control circuit for executing low power consumption mode |
| CN119311066A (en) * | 2024-12-16 | 2025-01-14 | 深圳市万微半导体有限公司 | A low power consumption circuit for power management chip |
| CN119311066B (en) * | 2024-12-16 | 2025-03-07 | 深圳市万微半导体有限公司 | Low-power consumption circuit of power management chip |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202712965U (en) | Intelligentization energy-saving system capable of automatic switches between AC (alternating current) power supply and battery | |
| CN106410940B (en) | Solar battery and its control method with battery low temperature auxiliary heating function | |
| CN203674082U (en) | Relay control circuit | |
| CN103401409A (en) | Dynamic dummy load with simple structure | |
| CN201449569U (en) | Micro power consumption and low voltage drop sensor constant current driving circuit | |
| CN205389278U (en) | ON -OFF control circuit of LED lamp | |
| CN203482088U (en) | Dynamic dummy load of simple structure | |
| CN201937563U (en) | Standby low-power consumption power supply switch suitable for single chip microcomputer controller | |
| CN205725455U (en) | A kind of Micro Energy Lose low pressure drop sensor constant-current drive circuit | |
| CN201860166U (en) | Battery switching circuit for medical power supply | |
| CN202602976U (en) | A remote control with USB and sleep wake-up device | |
| CN212992000U (en) | Battery power supply control circuit | |
| CN204302733U (en) | A kind of ON-OFF control circuit based on touch controlled key | |
| CN203907889U (en) | Drive circuit of electricity load and air conditioner | |
| CN202772365U (en) | Air-conditioning operating state display socket | |
| CN203444380U (en) | Output voltage control circuit | |
| CN202997691U (en) | An automatic switching circuit capable of switching power between a power supply and a battery in an electronic switch | |
| CN202586784U (en) | Low power consumption dual power supply energy-saving circuit | |
| CN203025577U (en) | Temperature control device based on single chip microcomputer | |
| CN206878507U (en) | A kind of measuring instrument radio communication device power control system | |
| CN201690430U (en) | Oven timer circuit with low power consumption | |
| CN203422622U (en) | Circuit reducing whole machine standby power consumption | |
| CN202103636U (en) | Point contact type low-power consumption dormancy circuit of electric bicycle | |
| CN212660144U (en) | Battery-powered low-power-consumption electronic switch circuit | |
| CN115566786B (en) | Handheld low-power-consumption temperature and humidity detector |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| DD01 | Delivery of document by public notice |
Addressee: Wang Shixing Document name: Notification to Pay the Fees |
|
| DD01 | Delivery of document by public notice |
Addressee: Wang Shixing Document name: Notification of Termination of Patent Right |
|
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100505 Termination date: 20120814 |